aside,main{
    margin-top:40px;
    float: left;
}


.side_menu>div{
    width: 200px;
    height: 30px;
    border: 1px solid #3366ff;
    border-bottom: none;
    line-height: 30px;
    text-align: center;
    background: #3366dd;
    cursor: pointer;
}

.side_menu ul{
    width: 202px;
    text-align: center;
    overflow: hidden;
    font-size: 14px;
    padding-left: 0px;
    margin: 0px;
    display: none;
}
.side_menu ul a{
    text-decoration:none;
}
.side_menu ul a:hover li{
    background: #3366ee;
    color:#fff;
}
.side_menu ul li{
    line-height: 30px;
    height: 30px;
    width: 200px;
    border: 1px solid #eee;
    background: #fff;
    list-style-type:none;

}

